My own experience with Appen scammers. I tried to apply as a translator. First of all, a translator would receive more serious questions than ''have you done any translations''. He would be asked about his education, requested to submit a copy of his education papers (in my country translation is an MA course), asked questions about language combinations, computer assisted translation tools he uses, fields of expertise and years of experience. He would be requested to submit a CV and, if that CV is interesting for the potential employer, asked to do a test and, if successful, be offered a job (a freelancer's contract or a staff position). Some employers want to see your references, that is only for top class jobs, in most cases you just prove your education and experience. Those are legit employers. Appen just asks ''have you ever done a translation'' and accepts yes for an answer. The same way they could ask you if you are an astronaut. After some bureaucratic procedures they offered a project. Ok now I will start working - but guess what? There is no project, instead they announce that now they will ''evaluate'' me for 60 days. They have not received my CV or a copy of my MA paper and I have not taken a test - there is nothing to evaluate! I told them to get lost, blocked their email and look forward to never hearing from them again.
Besides that, Appen boosts its non-existing reputation by flooding the web with fake positive propaganda articles and censoring the comment section of these articles.